mercenary vs powertech dps

I just hit 10 on my bh and i have been stuck on which to choose between powertech and mercenary. both sound amazing. ive heard that merc does more damage but powertech is more mobile. im not looking for which is best dps i would just like to hear opinions on the 2. maybe it will help me choose.

I would say, merc is probably better for DPS, mainly because its ranged and the game is swarmed with melee classes already. Between 2 tanks, and upto 2 melee DPS most raid groups will not take more melee, hardmode flashpoints are also significantly harder with melee DPS and some verge on impossible with 2 melee DPS. (TFE, juido wei. BFI kel thaak) down to severe DPS loss while moving. Im not saying dont play PT, by all means play whatever you prefer, but unless your playing with friends, this is something you should consider as most groups are less happy about taking melee.
I know this well, 50 assassin, 50 marauder, both full columi geared.

I'm a 50 Marauder here and I echo every point Vortae said. The end game is alot more difficult, and in some cases seemingly impossible, stacking melee at this point. I've been sat for a few bosses just because I was a melee and didn't complete Battle for Ilum till the melee officer in our guild had done it since you have to have at least one ranged for the Kel fight. I'm full columi geared with my 4p so I'm easily able to put out the numbers needed to get past that encounter. It's just that ranged are at a premium compared to melee at this point, especially in my guild, and having encounters that predicated toward ranged makes life fairly difficult for everyone. I'd suggest going Merc here but it's all up to you. I just know you'll have an easier time with the ranged class in the endgame, unless you know your guild will be crawling with ranged already.